Specifications: Name:Multifunctional Sports Helmet;  Net weight:About 0.253KG;  Gross weight:About 0.27KG;  Head size About 48-52CM/18.90-20.47in;  Buffer:High Density EPS;  Lining:Polyester fiber;  Process:Unibody;  Ventilation hole:12 ventilation hole;  Inner size:About 16*20.5CM/6.30*8.07in;  Shell size:About 25.5*20*16CM/10.04*7.87*6.30in;  Housing:High-strength PC;    Features: 1. Unibody And Strong Protection: The high hardness PC shell and unibody technology provide the better safety for baby's head.  2. High-density EPS Foaming: The lining is made from high-density EPS foam, which is light and shockproof to cushion impact damage and effectively protect safety.  3. 12 Ventilation Holes: There are 12 ventilation holes for ventilation, so the helmet is not sweating that baby is comfortable to wear.  4. Helmet Taillights: The taillights make you safer to ride at night, and it has three adjustable flicker modes.  5. Removable Lining: The design is for easy cleaning. The taillight head with adjustment light is suitable for a variety of head size. The high quality nylon buckle has the removable chin pad, which is comfortable and hygienic.    Package included: 1 x Child Bicycle Helmet;